A true meningocele represents 1 type of neural tube defect that is caused by failure of the surface ectoderm to separate from the neuroectoderm early in embryonic development. This results in a bony defect of the skull, allowing herniation of the meninges (meningocele) and brain tissue (encephalocele). Meningoencephaloceles, however, rarely occur at the anterior fontanelle.1 Sporadic reports exist on leptomeningeal cysts due to vacuum extraction, which are predominantly located over the anterior fontanelle.2
Kau T, Scharfegger H, Gasser J, Hausegger KA. Pseudomeningocele and Traumatic Brain Lesion Following Vacuum Extraction Delivery. Arch Neurol. 2007;64(7):1048–1049. doi:10.1001/archneur.64.7.1048
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